sys.fn_cdc_decrement_lsn (Transact-SQL)
Returns the previous log sequence number (LSN) in the sequence based upon the specified LSN.
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Transact-SQL Syntax Conventions
Syntax
sys.fn_cdc_decrement_lsn ( lsn_value )
Arguments
- lsn_value
LSN value. lsn_value is binary(10).
Return Type
binary(10)
Remarks
The LSN returned by the function is always less than the specified value, and no LSN values can exist between the two values.
Permissions
Requires membership in the public database role.
Examples
The following example uses sys.fn_cdc_decrement_lsn to set the upper LSN boundary in a query that returns change data rows that have LSN values less than the maximum LSN value.
Use AdventureWorks2012;
GO
DECLARE @from_lsn binary(10), @to_lsn binary(10);
SET @from_lsn = sys.fn_cdc_get_min_lsn('HumanResources_Employee');
SET @to_lsn = sys.fn_cdc_decrement_lsn(sys.fn_cdc_get_max_lsn());
SELECT * FROM cdc.fn_cdc_get_all_changes_HumanResources_Employee( @from_lsn, @to_lsn, 'all');
GO
See Also
Reference
sys.fn_cdc_increment_lsn (Transact-SQL)
sys.fn_cdc_get_min_lsn (Transact-SQL)
sys.fn_cdc_get_max_lsn (Transact-SQL)